Process for obtaining iodine



Patented Dec. 5, 1922.

PAT J OSWALD voN FABER, or THE HAGUE, NETHERLANDS.

PROCESS FOR OBTAINING IODINE.

No Drawing.

To all whom it may concern I Be it known that I, Dr. OSWALD VON FABER, a subject of the Queen of the Netherlands, residing at 73 Regentesselaan, The Hague, the Netherlands, have invented certain new and useful Improvements in Processes for Obtaining Iodine, of which the following is a specification.

act to dissolve the iodin in the form of,

potassium iodide and potassium iodate. From these compounds the iodin had to be separated by a laborious method.

It has been proposed to obtain iodine from iodin-containing carbon by means of heating, but only very small ,amounts of iodine have been recovered by this method.

Now I have found that it is possible to obtain the iodine from the iodin-containing-adsorbing material if I take special precautions. The process according to my invention may be carried out for instance in such a way that the iodine vapors which are developed by heating are separated from the iodin-containing carbonaceous material. The heating is preferably carried out in a still although any other suitable vessel may be used without departing from the scope of my invention. During the heating I prefer to lead a gaseous medium through or over the iodin-containing material which gaseous medium is of such a nature that the same does not react with the iodine. I have found that carbon dioxid is very suitable for the purpose which I have in view but any other suitable gaseous medium may be used. The gaseous medium is introduced into the vessel containing the carbonaceous material, and I may use the gaseous medium under atmospheric pressure although in some instances it is of advantage to use the gaseous medium under higher pressiire or even under reduced pressure.

Very favourable results are obtained in heating the iodin-containing material to Application filed August 12, 1921.

Serial No. 491,835.

incandescence and the process may be carried out also in such a manner that the carbonaceous material is partially or completely burnt.

After the carbonaceous material has ad- .sorbed the iodine I may, if desired, wash the material by means of water or any other suitable liquid. In this case I preferably dry the carbonaceous material before heating the same although it may be of advantage to heat the material in a wet state.

I may use any suitable source of iodine and the invention therefore is not restricted to the use of any special iodin-containing material although iodin-containing mineral waters are preferred as a raw material.

As stated above I may use carbon dioxid as a gas which promotes the separation of iodine from the adsorbing material. vessel containing the adsorbing material may be partially evacuated and the gas may be introduced into the vessel by suction.

However it is not necessary to use a vacuum as it is possible to carry out the process by atmospheric pressure and even by forcing the gas through the vessel.

Besides gases which do not react with the iodine nor with the carbonaceous material I may use other gases as for instance air. In this way I may cause a partial or. com- .plete burning of the carbonaceous material.

I also may mix the carbonaceous material with substances which develop oxygen during the heating.

The heating drives off the iodine, principally as vapor of iodine, but, under some circumstances more or less hydriodic acid or other iodine compounds may be formed.

In order that my invention may be better understood I give, by way of example,

a method for the carrying out of the process .althoughitis-to be understood that I am not taini-ng 0.1 'g'r. of iodine per liter. The

The

present in 10,000 1. of mineral water coniodin-containing, carbon vis washed with water and then dried at a temperature so .low that no volatilization of iodine occurs. Then the material is further heated up to about 500 0., while carbon dioxid is led through and over the mass. The iodine is obtained quantitatively.

I claim:

1. Process for obtaining iodine from iodin-containing solutions by adsorbing iodine by means of solid adsorbent carbonaceous material, heating the iodin-containing carbonaceous material and separating the iodin-containing vapors which are developed by such heating.

2. Process for obtaining iodine from iodin-containing solutions by adsorbing iodine by means of solid adsorbent carbonaceous material, heating the iodin-containing carbonaceous material and separating the vapors containing iodin, which are developed by such heating, by means of a gaseous medium which does not react with the iodine.

3. Process for obtaining iodine from iodin-containing solutions by adsorbing iodine by means of solid adsorbent carbonaceous material, heating the iodin-containing carbonaceous material and separating the iodin-containing vapors which are developed by such heating, by means of carbon dioxid.

4. Process for obtaining iodine from iodin-containing solutions by adsorbing iodine by means of solid adsorbent carbonaceous material, heating the -iodin-contain-' ing carbonaceous material and separating the iodin-containing vapors which are developed by such heating, by means of a gaseous medium under pressure, which does not react with the iodine.

5. Process for obtaining iodine from iodin-containing solutions by adsorbing iodine by means of solid adsorbent carbonaceous material, heating the iodin-containing carbonaceous material and separating the iodin-containing vapors which are de veloped by such heating, by conveying an inert gas under reduced pressure in contact with such material.

6. Process for obtaining iodine from iodin-containing solutions by adsorbing iodine by means of solid adsorbent carbonaceous material, heating the iodin-containing carbonaceous material to incandescence and separating the iodin-containing vapors which are developed by such heating, the heating being to a temperature at which the carbonaceous material is in an incandescent state.

7. Process for obtaining iodine from reason iodin-containing solutions by adsorbing iodine by means of solid adsorbent carbonaceous material, heating the iodin-containing carbonaceous material and separating the iodinbontaining vapors which are developed by such heating, the heating being carried out in such a way that the carbonaceous material is partially burnt.

8. Process for obtaining iodine from iodin-containing solutions by adsorbing iodine by means of solid adsorbent carbonaceous material, heating the iodin-c-ontaining carbonaceous material and separating the iodin-containing vapors which are developed by such heating, the heating being carried out in such a way that the carbonaceous material is completely burnt.

9. Process for obtaining iodine from iodin-containing solutions by adsorbing iodine by means of solid adsorbent carbonaceous material, washing the iodin-containing carbonaceous material, drying and heating the same and separating the iodin-containing vapors which are developed by such heating.

10. Process for obtaining iodine by adsorbing iodine by means of solid adsorbent carbonaceous material, heating the iodincontaining carbonaceous material andseparating the iodin-containing vapors which are developed by such heating.

11. Process for obtaining iodine by ad-' sorbing iodine by means of solid adsorbent carbonaceous material, heating 'the iodincontaining carbonaceous material and separating the iodin-containing vapors which are developed by such heating, by means of a gaseous medium which does not react with the iodine.

, 12. Process for obtaining iodine by adsorbing iodine by means of solid adsorbent carbonaceous material, heating the iodincontaining carbonaceous material and separating the iodin-containing vapors which are developed by such heating, by means of carbon dioxid.

13. Process for obtaining iodine by adsorbing iodine by means of solid adsorbent carbonaceous material, heating the iodin-containing carbonaceous material and separating the iodin-containing vapors which are developed by such heating, by leading a gaseous medium in contact with the iod-in-containing carbonaceous material.

In testimony whereof I affix mysignature.

n1. oswann 5N mean 

